Device for biological purification of waste water



FIG. 1 is a perspective view of a device for biological purification of waste water in accordance with my design;

FIG. 2 is a first side view of the device for biological purification of waste water in accordance with my design;

FIG. 3 is a second side view of the device for biological purification of waste water in accordance with my design;

FIG. 4 is a third side view of the device for biological purification of waste water in accordance with my design;

FIG. 5 is a fourth side view of the device for biological purification of waste water in accordance with my design;

FIG. 6 is a top plan view of the device for biological purification of waste water in accordance with my design; and,

FIG. 7 is a bottom plan view of the device for biological purification of waste water in accordance with my design. 

The ornamental design for device for biological purification of waste water, as shown and described. 